@article{PismaZhETF.33.380,
    title = {Analytic continuation of the integral equations of the theory of scattering by an unphysical energy sheet},
    author = {Orlov, Yu. V.},
    journal = {Письма в ЖЭТФ},
    volume = {33},
    issue = {7},
    pages = {380},
    year = {1981},
    doi = {},
    url = {http://jetpletters.ru/ps/0/article_23034.shtml},
}